Initial condition problem for cosmological N-body simulations

T. Tatekawa*, S. Mizuno

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


For a long time, the Lagrangian linear perturbation (Zel'dovich approximation, ZA) is used for initial conditions for cosmological N-body simulations. Recently, Crocce et al. (2006) proposed the improvement of the initial conditions. They applied Lagrangian second-order perturbation (2LPT) for the initial condition. Then they calculated the Lagrangian linear perturbation and showed that 2LPT initial conditions improve the evolution of non-Gaussianity for the density fluctuation in the Universe. Here we have one question. Although 2LPT initial conditions improve the cosmological N-body simulation, is 2LPT initial conditions sufficient? To answer this question, in addition to the ZA and 2LPT, we also calculate the non-Gaussianity with the initial conditions based on third-order Lagrangian perturbation theory (3LPT). Then we show reasonable order of perturbation and redshift for the initial conditions.

Original languageEnglish
Title of host publicationEAS Publications Series
Number of pages2
Publication statusPublished - 2009
Externally publishedYes

Publication series

NameEAS Publications Series
ISSN (Print)16334760
ISSN (Electronic)16381963

ASJC Scopus subject areas

  • General Engineering


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